Electric balance vehicle

ABSTRACT

An electric balance vehicle including a top cover, a bottom cover, an inner cover, a rotating mechanism, two wheels, two hub motors, a plurality of sensors, a power supply, and a controller is described herein. The bottom cover is fixed to the top cover. The inner cover is fixed between the top cover and the bottom cover. The two wheels are rotatably fixed at two sides of the inner cover, respectively. The two hub motors are fixed in the two wheels, respectively. The plurality of sensors is disposed between the bottom cover and the inner cover, respectively. The power supply is fixed between the first bottom cover and the first inner cover. The controller is fixed between the second bottom cover and the second inner cover, the controller is electrically connected with the plurality of sensors, the power supply, and the hub motors.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of co-pending application Ser. No.14/773,650 filed on Sep. 8, 2015, which is a U.S. National Stage ofInternational Application No. PCT/CN2014/092849 filed on Dec. 2, 2014,for which priority is claimed under 35 U.S.C. §120; and this applicationclaims priority of Application No. 201410262353.9 filed in China on Jun.13, 2014 under 35 U.S.C. §119, the entire contents of all of which arehereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an electric balance two-wheeledvehicle, of which two platforms for carrying people can rotate relativeto each other to drive.

2. Description of the Related Art

An electric balance vehicle is also known as a somatosensory vehicle ora sensor controlled vehicle. The operating principle thereof is mainlyestablished on a basic principle called “dynamic stabilization”, thechange of car attitudes is detected by a gyroscope and an accelerationsensor inside the vehicle body, and a motor is accurately driven by aservo control system to adjust correspondingly, in order to keep thebalance of the system.

The existing electric balance vehicle generally has an operating rod. Auser stands on a foot platform of the balance vehicle to operate theoperating rod so as to advance, retreat, and stop, and this control isalso known as “manual control”. The foot platform of the existingbalance vehicle is generally a flat plate, and the foot platform isalways kept in a horizontal state during use and cannot rotaterelatively. Therefore, the user cannot control the balance vehiclemerely through the feet.

BRIEF SUMMARY OF THE INVENTION

In order to overcome at least one defect in the prior art, the presentinvention provides an electric balance vehicle.

To achieve the above objective, the present invention provides anelectric balance vehicle including a top cover, a bottom cover, an innercover, a rotating mechanism, two wheels, two hub motors, a plurality ofsensors, a power supply, and a controller. The top cover includes afirst top cover and a second top cover disposed symmetrically androtatable relative to each other. The bottom cover is fixed to the topcover, and the bottom cover includes a first bottom cover and a secondbottom cover disposed symmetrically and rotatable relative to eachother. The inner cover is fixed between the top cover and the bottomcover, and the inner cover includes a first inner cover and a secondinner cover disposed symmetrically and rotatable relative to each other.The rotating mechanism is fixed between the first inner cover and thesecond inner cover. The rotating mechanism includes two bearings, ashaft sleeve, and two snap springs. The two bearings are fixed to thefirst inner cover and the second inner cover, respectively, and theshaft sleeve is fixed inside the two bearings and is fixed to the innercover via the two snap springs. The two wheels are rotatably fixed attwo sides of the inner cover, respectively. The two hub motors are fixedin the two wheels, respectively. The plurality of sensors is disposedbetween the bottom cover and the inner cover, respectively. The powersupply is fixed between the first bottom cover and the first innercover. The controller is fixed between the second bottom cover and thesecond inner cover. The controller is electrically connected with theplurality of sensors, the power supply, and the hub motors, and thecontroller controls the hub motors to drive the corresponding wheels torotate according to sensing signals transmitted by the sensors.

According to one embodiment of the invention, the electric balancevehicle may further include two pedals fixed to the top cover and theinner cover.

According to one embodiment of the invention, the pedals may havemutually separated friction strips disposed on upper surfaces of thepedals.

According to one embodiment of the invention, the first top cover andthe second top cover may have hollow spaces, respectively, the firstinner cover and the second inner cover may have recesses at positionscorresponding to the hollow spaces, respectively, and the hollow spacesmay be combined with the recesses to form pedal cavities for containingthe pedals.

According to one embodiment of the invention, the inner cover may have acylindrical barrel, and the bearings and the shaft sleeve may beinstalled in the barrel via the snap springs.

According to one embodiment of the invention, the electric balancevehicle may further include a decorative lamp disposed at the bottomcover.

According to one embodiment of the invention, the top cover may furtherinclude two indicating screens electrically connected with thecontroller. One indicating screen may display a remaining capacity ofthe power supply, and the other indicating screen may display a workingstate of the electric balance vehicle.

According to one embodiment of the invention, the sensor may include agyroscope, an acceleration sensor, and an inductive switch, theinductive switch may sense whether a user stands on the electric balancevehicle so as to be on or off, the controller may receive the sensingsignal of the inductive switch to control the hub motors to work or tostop, and the controller may receive the sensing signals of theacceleration sensor and the gyroscope to control the hub motors tochange a state or to keep the state.

According to one embodiment of the invention, the inductive switch maybe an infrared photoelectric sensor.

According to one embodiment of the invention, the electric balancevehicle may further include a charging interface disposed at the bottomcover.

According to one embodiment of the invention, the electric balancevehicle may further include an interface cover covering the charginginterface.

According to one embodiment of the invention, the electric balancevehicle may further include a limiting shaft disposed between the firstinner cover and the second inner cover, and the length of the limitingshaft in the second inner cover may be larger than the length of thelimiting shaft in the first inner cover.

According to one embodiment of the invention, the top cover may have twoarc-shaped projections, and the two arc-shaped projections may belocated above the two wheels and may cover a part of the wheels,respectively.

According to one embodiment of the invention, the width of thearc-shaped projections may be larger than the width of the wheels.

According to one embodiment of the invention, the top cover and thebottom cover may be made of plastic, and the inner cover may be made ofaluminum alloy.

According to one embodiment of the invention, the electric balancevehicle may further include a remote controller, and the controller mayreceive a control signal sent by the remote controller.

According to one embodiment of the invention, the controller may have astorage unit and a correction unit, the storage unit may store aninitial balance state of the electric balance vehicle, and thecorrection unit may correct a current balance state of the electricbalance vehicle.

In summary, according to the invention, the inner cover is uniquelydisposed between the top cover and the bottom cover of the electricbalance vehicle, such that the entire structure of the electric balancevehicle is firmer, and electronic elements inside the vehicle body areprotected at the same time. Further, a space for fixing the electronicelements is formed between the inner cover and the bottom cover, suchthat the electronic elements are installed more compactly. The powersupply and the controller are disposed in two parts of the vehicle body,respectively. Therefore, one power supply and one controller can controlthe two hub motors simultaneously, the assembly is easier, the wiring ismore convenient, and more space is saved. Meanwhile, the weights on bothsides of the vehicle body are better balanced thus to improve theself-balance of the vehicle body. According to the present invention,the wheels are located at the left and right edges of the vehicle body.Thus, the wheels with larger sizes can be used. Compared with theexisting balance vehicle with wheels installed at the bottom of thebottom cover, the electric balance vehicle has considerable movementdistance and speed advantages. Further, the hub motors are adopted inthe present invention, and the motors are directly installed in thewheels. Accordingly, the structure of the electric balance vehicle ismore compact. Compared with the balance vehicle singly installed with amotor, more space is saved and the entire device is more compact.

These and other features, aspects, and advantages of the presentinvention will become better understood with regard to the followingdescription, appended claims, and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view showing an electric balance vehicle accordingto a first embodiment of the present invention;

FIG. 2 is an exploded schematic diagram showing the electric balancevehicle according to the first embodiment of the invention;

FIG. 3 is a schematic diagram showing the electric balance vehicleaccording to the first embodiment of the invention;

FIG. 4 is a schematic diagram showing the electric balance vehicle atanother angle according to the first embodiment of the invention;

FIG. 5 is a partial functional block diagram of the electric balancevehicle according to the first embodiment of the invention; and

FIG. 6 is a schematic diagram showing an electric balance vehicleaccording to a second embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

Please refer to FIG. 1 to FIG. 5 together. An electric balance vehicle100 in this embodiment includes a top cover 1, an inner cover 2, abottom cover 3, two hub motors 4, two wheels 50, a rotating mechanism60, a plurality of sensors 80, a power supply 81, and a controller 82.

The top cover 1 includes a first top cover 11 and a second top cover 12,and the first top cover 11 and the second top cover 12 are disposedsymmetrically and rotatable relative to each other. When the electricbalance vehicle 100 is in a using state, the top cover 1 is located atthe top. The first top cover 11 may be a left top cover, and the secondtop cover 12 may be a right top cover. However, the invention is notlimited thereto. When the electric balance vehicle 100 is rotated 180degrees horizontally, the first top cover 11 becomes the right topcover, and the second top cover 12 becomes the left top cover.

The shapes of the first top cover 11 and the second top cover 12 arebasically the same, and the first top cover 11 and the second top cover12 can rotate relative to each other under the action of the rotatingmechanism 60. The inward parts of the first top cover 11 and the secondtop cover 12 are connected to form an X shape, and two indicatingscreens 13 are disposed at the inner ends. The indicating screens 13 areelectrically connected with the controller 82, wherein one of theindicating screens 13 can display a remaining capacity of the powersupply 81, and the other indicating screen 13 can display a workingstate of the electric balance vehicle 100. In actual application, atransparent outer cover 14 is disposed on each indicating screen 13 forprotecting the indicating screen 13 and facilitating reading for a user.The indicating screen 13 displaying the working state can displaydifferent icons (for example, a battery icon and the like) according todifferent modes of the electric balance vehicle 100, for example, a lowspeed mode, a high speed mode, a normal system state, a locked state andthe like, thereby enabling the user to intuitively and clearlyunderstand the working state of the electric balance vehicle 100.

In the embodiment, outward parts of the first top cover 11 and thesecond top cover 12 have arc-shaped projections 15, respectively, andthe two arc-shaped projections 15 are located above the two wheels 50and cover a part of the wheels 50, respectively. In the firstembodiment, the width W1 of each of the arc-shaped projections 15 islarger than the width W2 of each of the wheels 50. The arc-shapedprojections 15 completely cover the tops of the wheels 50. Due to thisarrangement, the arc-shaped projections 15 can effectively block muddywater splashed when the wheels 50 walk. Meanwhile, a hanging object (forexample, an overlong waistband of the clothes of the user) is preventedfrom being accidentally rolled into the wheels in a moving process tocause possible injury of the user, so that the safety of the electricbalance vehicle 100 is improved. However, the invention is not limitedthereto. In other embodiments, the arc-shaped projections 15 can bedesigned to be narrow at two ends and wide in the middle.

The bottom cover 3 is fixed to the top cover 1. In actual application,the top cover 1 and the bottom cover 3 can be fixed together by screws.In the present invention, the top cover 1, the inner cover 2, and thebottom cover 3 jointly form the framework of the electric balancevehicle 100, and after the top cover 1 and the bottom cover 3 are fixedtogether, the inner cover 2 is covered inside the vehicle body and isnot exposed. When the electric balance vehicle 100 is in the usingstate, the bottom cover 3 is located at the bottom.

The bottom cover 3 includes a first bottom cover 31 and a second bottomcover 32, and the first bottom cover 31 and the second bottom cover 32are disposed symmetrically and rotatable relative to each other. Theshapes of the first bottom cover 31 and the second bottom cover 32 arebasically the same, and the first bottom cover 31 and the second bottomcover 32 can rotate relative to each other under the action of therotating mechanism 60. The inward parts of the first bottom cover 31 andthe second bottom cover 32 are connected to form an X shape. Similarly,the first bottom cover 31 may be a left bottom cover, and the secondbottom cover 32 may be a right bottom cover. When the electric balancevehicle 100 is rotated 180 degrees horizontally, the first bottom cover31 becomes the right bottom cover, and the second bottom cover 32becomes the left bottom cover.

In the embodiment, the bottom cover 3 has two decorative lamps 33 forincreasing the beautiful appearance and playing an illumination role atthe same time. The shells of the decorative lamps 33 may be transparentfor transmitting light. In actual application, the decorative lamps 33may be electrically connected with the controller 82, so that thedecorative lamps 33 can reflect a driving state of the electric balancevehicle 100 to remind surrounding people, thereby improving the usingsafety. For example, when the electric balance vehicle 100 advances, thedecorative lamps 33 may stay lit; when the electric balance vehicle 100retreats, the decorative lamps 33 may flash; when the electric balancevehicle 100 turns left, the decorative lamp 33 at the left side mayflash or stay lit, and the decorative lamp 33 at the right side may beoff; when the electric balance vehicle 100 turns right, the decorativelamp 33 at the right side may flash or stay lit, and the decorative lamp33 at the left side may be off. The lighting states of the decorativelamps 33 are not limited in the invention.

The inner cover 2 is fixed between the top cover 1 and the bottom cover3. The inner cover 2 includes a first inner cover 21 and a second innercover 22, and the first inner cover 21 and the second inner cover 22 aredisposed symmetrically and rotatable relative to each other. The shapesof the first inner cover 21 and the second inner cover 22 are basicallythe same, and the first inner cover 21 and the second inner cover 22 canrotate relative to each other under the action of the rotating mechanism60. The rotating mechanism 60 may be installed in the middle of theinner cover 2, and the longitudinally installed hub motors 4 are fixedto the left and right edges. In the embodiment, the first inner cover 21and the second inner cover 22 are interconnected to form an entirety.However, the invention is not limited thereto. In other embodiments, thefirst inner cover 21 and the second inner cover 22 may be mutuallyseparated and independent components. Similarly, the first inner cover21 may be a left inner cover, and the second inner cover 22 may be aright inner cover. When the electric balance vehicle 100 is rotated 180degrees horizontally, the first inner cover 21 becomes the right innercover, and the second inner cover 22 becomes the left right cover.

In the embodiment, the electric balance vehicle 100 further includes twopedals 5, and the pedals 5 are fixed to the top cover 1 and the innercover 2. To enable the user to stand more stably in the moving process,mutually separated friction strips 51 are disposed on the upper surfaceof each pedal 5 of the balance vehicle 100 in the embodiment to increasethe friction force.

To fix the pedals 5 and reduce the volume of the balance vehicle 100,the first top cover 11 and the second top cover 12 have hollow spaces16, respectively, the first inner cover 21 and the second inner cover 22have recesses 23 at positions corresponding to the hollow spaces 16,respectively, and the hollow spaces 16 and the recesses 23 are mutuallycombined to form pedal cavities (not shown in FIG. 2) for containing thepedals 5. In actual application, the hollow spaces 16 are penetrated inthe top cover 1, the recesses 23 are not penetrated in the inner cover2, and the shapes of the hollow spaces 16 and the recesses 23 arematched with the shapes of the pedals 5. The pedal cavities arecontaining spaces having bottom surfaces and side walls formed after thecombination of the hollow spaces 16 with the recesses 23.

When in use, the pedals 5 directly carry the user. The inner cover 2 isused as the internal framework of the entire balance vehicle 100 toindirectly bear the weight of the user transferred by the pedals 5,thereby preventing electronic elements between the inner cover 2 and thebottom cover 3 from being extruded by the weight of the user. Therefore,the entire electric balance vehicle 100 is firmer and stronger, and theelectronic elements therein are protected, such that the balance vehicle100 operates more stably and has longer service life. Preferably, theinner cover 2 is made of aluminum alloy. Thus, the strength is higher,and the structure is more stable. The top cover 1 and the bottom cover 3are made of plastic, so that the weight of the entire vehicle body isreduced, the processes, such as spray coating, coloring and so on, areconveniently carried out on the appearance of the vehicle body, andantifouling and waterproof functions are achieved. Since theconventional electric balance vehicle does not include the inner cover2, the internal electronic elements directly bear the weight of theuser, and due to the shaking generated during the driving process of theconventional balance vehicle, an automatic power off situation is easyto occur, and the user is easy to fall down during driving. The electricbalance vehicle 100 in the present invention has solved this technicalproblem.

The rotating mechanism 60 is fixed between the first inner cover 21 andthe second inner cover 22. In the first embodiment, the rotatingmechanism 60 includes two bearings 61, a shaft sleeve 62, and two snapsprings 63. The two bearings 61 are fixed to the inner ends of the firstinner cover 21 and the second inner cover 22, respectively. The shaftsleeve 62 is fixed inside the two bearings 61 and is fixed to the innercover 2 via the two snap springs 63. Thus, the left and right innercovers of the inner cover 2 can rotate under the cooperation of therotating mechanism 60. Due to the arrangement of the rotating mechanism60, the two parts of the vehicle body of the electric balance vehicle100 can rotate freely and relatively.

To install the rotating mechanism 60, a cylindrical barrel 24 may bedesigned at the inward ends of the first inner cover 21 and the secondinner cover 22, and the bearings 61 and the shaft sleeve 62 areinstalled in the barrel 24 via the snap springs 63 from outside toinside. In order to limit an overlarge relative rotation angle betweenthe first inner cover 21 and the second inner cover 22, the electricbalance vehicle 100 further includes a limiting shaft 7, and the lengthof the limiting shaft 7 in the second inner cover 22 is larger than thelength of the limiting shaft 7 in the first inner cover 21. In theembodiment, the limiting shaft 7 is located between the inward ends ofthe first inner cover 21 and the second inner cover 22.

The two wheels 50 are rotatably fixed at two sides of the inner cover 2,respectively, and the two hub motors 4 are fixed in the two wheels 50,respectively. The hub motor 4 is also called in-wheel motor, whereinpower, transmission, and braking devices are incorporated into a hub, sothat a large quantity of transmission components can be omitted, thestructure of the balance vehicle can be simpler, a better spaceutilization rate can be obtained, and the transmission efficiency can beimproved at the same time. Since the hub motor 4 have the characteristicof independently driving a single wheel, differential steering similarto a crawler-type vehicle can be achieved by different rotating speedsand even by inversion of the left and right wheels 50, so that theturning radius of the vehicle can be greatly reduced, and in-situsteering can be nearly achieved under a particular condition.

The plurality of sensors 80 are disposed between the bottom cover 3 andthe inner cover 2. In detail, a half of the sensors 80 are disposedbetween the first bottom cover 31 and the first inner cover 21, and theother half of the sensors 80 are disposed between the second bottomcover 32 and the second inner cover 22. The power supply 81 is fixedbetween the first bottom cover 31 and the first inner cover 21. Thecontroller 82 is fixed between the second bottom cover 32 and the secondinner cover 22. In the present invention, only one power supply 81 andone controller 82 are required to simultaneously control the two hubmotors 4, so that the assembling is easier, the wiring is moreconvenient, and the repairing of the sold electric balance vehicle 100returned to the factory is more convenient. Moreover, the power supply81 and the controller 82 are disposed in two half parts of the vehiclebody, respectively. Thus, more space is saved, and the structure of theentire vehicle body is more compact. An electric wire connecting thepower supply 81 and the controller 82 and the electric wires connectingthe controller 82 and the hub motors 4 can penetrate through the jointof the two half parts of the vehicle body, that is the electric wirespenetrate from the left half part (or the right half part) of thevehicle body to the right half part (or the left half part).

In the embodiment, the sensors 80 include a gyroscope 83, an inductiveswitch 84, and an acceleration sensor 85. In actual application, tomodularize the internal elements of the entire device, the accelerationsensor 85 and the gyroscope 83 are disposed on the same circuit board.Due to a visual angle, only the front surface of the circuit board canbe seen in FIG. 2, and the acceleration sensor 85 and the gyroscope 83(indicated by dotted lines in FIG. 2) are disposed on the back surfaceof the circuit board in actual application. The controller 82 iselectrically connected with the plurality of sensors 80, the powersupply 81, and the hub motors 4, and the controller 82 controls the hubmotors 4 to drive the corresponding wheels 50 to rotate according tosensing signals transmitted by the sensors 80.

The inductive switch 84 senses whether the user stands on the electricbalance vehicle 100 so as to be on or off, the controller 82 receivesthe sensing signal (i.e., the on or off signal) of the inductive switch84 to control the hub motors 4 to work or to stop, and the controller 82receives the sensing signals of the acceleration sensor 85 and thegyroscope 83 to control the hub motors 4 to change the state or to keepthe state. In the first embodiment, the inductive switch 84 is aninfrared photoelectric sensor. However, the invention is not limitedthereto. In other embodiments, the inductive switch 84 may be amicrowave inductive switch, an ultrasonic inductive switch, or any otherinductive switches capable of achieving the same function. In theembodiment, the electric balance vehicle 100 further includes a blockingelement 86. When the user stamps on the pedals 5, the blocking element86 will block an infrared induction area of the infrared photoelectricsensor, and thus the infrared photoelectric sensor is started. Thecontroller 82 receives a starting signal sent by the inductive switch84, thereby driving the hub motors 4 to work.

The wheels of the balance vehicle in the prior art start rotatingautomatically once the balance vehicle is enabled, so that the usercannot easily stand on the balance vehicle. When the user gets off fromthe balance vehicle, the wheels do not stop rotating, and the entirewheels stop rotating only after the power switch is turned off. Thus, avery huge potential risk exists, and the using is very inconvenient.When the electric balance vehicle 100 in the embodiment is enabled, thehub motors 4 do not work, while the wheels 50 are driven by sensingwhether the user stands on the pedals 5, thereby avoiding the blindrotating situation of the balance vehicle in the prior art and greatlyimproving the using safety. On the other hand, the electric balancevehicle 100 in the embodiment achieves automatic balance after sensingthe stamping instead of balancing once the power supply is turned on, sothat the safety of the vehicle body can be guaranteed, the rotation ofthe vehicle body is little to avoid the problem in the prior art thatautomatic balance is achieved once the power supply is turned on tocause a wrong balance point of the vehicle body and the vehicle bodyrotates to result in unbalance of the user.

The acceleration sensor 85 and the gyroscope 83 detect the motion stateof the balance vehicle 100 together, for example, the acceleration, theangular speed and the like of the balance vehicle 100. The controller 82drives the hub motors 4 according to the sensing signals transmitted bythe acceleration sensor 85 and the gyroscope 83, thereby determining tochange the direction or the speed of the balance vehicle 100 or not. Thedetection technology of the acceleration sensor 85 and the gyroscope 83is conventional and will not be described herein for a concise purpose.

In the embodiment, the electric balance vehicle 100 further includes aU-shaped fixing element 9. The sensors 80 and the blocking element 86are fixed to the U-shaped fixing element 9, in order to achievemodularized installation of the electronic elements of the entire deviceto facilitate the assembly, wiring and the subsequent maintenance.

In practice, the user drives a part or two parts of the vehicle body totwist by forces of the feet, in order to drive the sensors 80 to sendthe sensing signals to the controller 82. The controller 82 drives thehub motors 4 to operate according to an internal control program, toenable the user to turn, advance or retreat, so that “foot control” isachieved, the use is more convenient, and the control is more flexible.

How the controller 82 in the present invention controls the balancevehicle to achieve a self-balancing state and controls the wheels 50 toadvance, retreat or turn belongs to the prior art, and will not bedescribed herein for a concise purpose. Specific reference can refer tocurrently disclosed balance vehicle control methods and controltechnologies adopted by balance vehicle production enterprises. Forexample, the Chinese patent application No. 201320050547.3, entitledBALANCE CONTROL DEVICE FOR INTELLIGENT BALANCING VEHICLE AND INTELLIGENTBALANCING VEHICLE, wherein the control device may be the controller 82in the embodiment. Or, for example, the Chinese patent application No.201220367045.9, entitled CIRCUIT CONTROL DEVICE FOR CONTROLLINGBALANCING VEHICLE MOTOR BY USING CPLD. Certainly, in actual application,other control devices and control methods can also be selected, forexample, the control method described in the Chinese patent applicationNo. 201310516158.X, entitled CONTROL METHOD FOR TWO-WHEELEDSELF-BALANCING VEHICLE.

In the embodiment, the electric balance vehicle 100 further includes acharging interface 87, and the charging interface 87 is disposed at thebottom cover 3. Specifically, the charging interface 87 is disposed atthe outer side of the bottom cover 3 for charging the power supply 81conveniently.

In the embodiment, the controller 82 has a storage unit 821 and acorrection unit 822, the storage unit 821 stores an initial balancestate of the electric balance vehicle 100, and the correction unit 822corrects a current balance state of the electric balance vehicle 100.Specifically, after the electric balance vehicle 100 is delivered out ofthe factory, the data when the vehicle body is placed horizontally isrecorded in the storage unit 821. After the electric balance vehicle 100is used for a period of time, due to external environments, such astemperature and so on, and using situations such as shaking, the sensors80 of the electric balance vehicle 100 may deviate to a certain extent,so that the horizontal reference value of the electric balance vehicle100 will change correspondingly. At that time, if the horizontal dataadopted when leaving the factory is still adopted, the electric balancevehicle 100 is controlled inaccurately. After long term use, accidentsmay happen. A correction program is stored in the correction unit 822 inthe embodiment. When the correction program is operated, the electricbalance vehicle 100 detects the real-time conditions of the sensors 80and judges and compares the real-time conditions with the initialhorizontal data, so as to determine whether to overwrite the originaldata for resetting. By setting the correction program, the controlaccuracy and the service life of the electric balance vehicle 100 aregreatly improved, and the problem in the prior art that the flexibilityand the accuracy of the balance vehicle decline after the balancevehicle is used for a period of time is solved.

FIG. 6 is a schematic diagram showing an electric balance vehicleaccording to a second embodiment of the invention. Please refer to FIG.6. The only difference between the electric balance vehicle 200 in thesecond embodiment and the electric balance vehicle 100 in the firstembodiment lies in that the electric balance vehicle 200 furtherincludes a remote controller 210, and the controller receives a controlsignal sent by the remote controller 210. Remote control of the electricbalance vehicle 200 can be achieved by the remote controller 210. Astartup button and a correction button and the like can be disposed onthe remote controller 210. However, the invention is not limitedthereto. The electric balance vehicle 200 further includes an interfacecover 310, and the interface cover 220 covers the charging interface.The interface cover 220 can prevent muddy water splashed by operatingthe electric balance vehicle 200 from polluting the charging interfaceand even entering the vehicle body.

In summary, according to the invention, the inner cover is uniquelydisposed between the top cover and the bottom cover of the electricbalance vehicle, such that the entire structure of the electric balancevehicle is firmer, and the electronic elements inside the vehicle bodyare protected at the same time. Further, the space for fixing theelectronic elements is formed between the inner cover and the bottomcover, such that the electronic elements are installed more compactly.The power supply and the controller are disposed in two parts of thevehicle body, respectively. Therefore, one power supply and onecontroller can control the two hub motors simultaneously, the assemblyis easier, the wiring is more convenient, and more space is saved.Meanwhile, the weights on both sides of the vehicle body are betterbalanced thus to improve the self-balance of the vehicle body. Accordingto the present invention, the wheels are located at the left and rightedges of the vehicle body. Thus, the wheels with larger sizes can beused. Compared with the existing balance vehicle with wheels installedat the bottom of the bottom cover, the electric balance vehicle hasconsiderable movement distance and speed advantages. Further, the hubmotors are adopted in the present invention, and the motors are directlyinstalled in the wheels. Accordingly, the structure of the electricbalance vehicle is more compact. Compared with the balance vehiclesingly installed with a motor, more space is saved and the entire deviceis more compact.

Although the present invention has been described in considerable detailwith reference to certain preferred embodiments thereof, the disclosureis not for limiting the scope of the invention. Persons having ordinaryskill in the art may make various modifications and changes withoutdeparting from the scope and spirit of the invention. Therefore, thescope of the appended claims should not be limited to the description ofthe preferred embodiments described above.

What is claimed is:
 1. An electric balance vehicle, comprising: a topcover comprising a first top cover and a second top cover disposedsymmetrically and rotatable relative to each other; a bottom cover fixedto the top cover, the bottom cover comprising a first bottom cover and asecond bottom cover disposed symmetrically and rotatable relative toeach other; an inner cover fixed between the top cover and the bottomcover, the inner cover comprising a first inner cover and a second innercover disposed symmetrically and rotatable relative to each other; arotating mechanism fixed between the first inner cover and the secondinner cover, the rotating mechanism having two bearings, a shaft sleeve,and two snap springs, the two bearings fixed to the first inner coverand the second inner cover, respectively, and the shaft sleeve fixedinside the two bearings and fixed to the inner cover via the two snapsprings; two wheels rotatably fixed at two sides of the inner cover,respectively; two hub motors fixed in the two wheels, respectively; aplurality of sensors disposed between the bottom cover and the innercover; a power supply fixed between the first bottom cover and the firstinner cover; and a controller fixed between the second bottom cover andthe second inner cover, wherein the controller is electrically connectedwith the plurality of sensors, the power supply, and the hub motors, andthe controller controls the hub motors to drive the corresponding wheelsto rotate according to sensing signals transmitted by the sensors. 2.The electric balance vehicle according to claim 1, further comprisingtwo pedals, wherein the pedals are fixed to the top cover and the innercover.
 3. The electric balance vehicle according to claim 2, wherein thepedals have mutually separated friction strips disposed on uppersurfaces of the pedals.
 4. The electric balance vehicle according toclaim 2, wherein the first top cover and the second top cover havehollow spaces, respectively, the first inner cover and the second innercover have recesses at positions corresponding to the hollow spaces,respectively, and the hollow spaces are combined with the recesses toform pedal cavities for containing the pedals.
 5. The electric balancevehicle according to claim 1, wherein the inner cover has a cylindricalbarrel, and the bearings and the shaft sleeve are installed in thebarrel via the snap springs.
 6. The electric balance vehicle accordingto claim 1, further comprising a decorative lamp disposed at the bottomcover.
 7. The electric balance vehicle according to claim 1, wherein thetop cover further includes two indicating screens electrically connectedwith the controller, one indicating screen displays a remaining capacityof the power supply, and the other indicating screen displays a workingstate of the electric balance vehicle.
 8. The electric balance vehicleaccording to claim 1, wherein the sensor comprises a gyroscope, anacceleration sensor, and an inductive switch, the inductive switchsenses whether a user stands on the electric balance vehicle so as to beon or off, the controller receives the sensing signal of the inductiveswitch to control the hub motors to work or to stop, and the controllerreceives the sensing signals of the acceleration sensor and thegyroscope to control the hub motors to change a state or to keep thestate.
 9. The electric balance vehicle according to claim 8, wherein theinductive switch is an infrared photoelectric sensor.
 10. The electricbalance vehicle according to claim 1, further comprising a charginginterface disposed at the bottom cover.
 11. The electric balance vehicleaccording to claim 10, further comprising an interface cover, whereinthe interface cover covers the charging interface.
 12. The electricbalance vehicle according to claim 1, further comprising a limitingshaft disposed between the first inner cover and the second inner cover,wherein the length of the limiting shaft in the second inner cover islarger than the length of the limiting shaft in the first inner cover.13. The electric balance vehicle according to claim 1, wherein the topcover has two arc-shaped projections, and the two arc-shaped projectionsare located above the two wheels and cover a part of the wheels,respectively.
 14. The electric balance vehicle according to claim 13,wherein the width of the arc-shaped projections is larger than the widthof the wheels.
 15. The electric balance vehicle according to claim 1,wherein the top cover and the bottom cover are made of plastic, and theinner cover is made of aluminum alloy.
 16. The electric balance vehicleaccording to claim 1, further comprising a remote controller, whereinthe controller receives a control signal sent by the remote controller.17. The electric balance vehicle according to claim 1, wherein thecontroller has a storage unit and a correction unit, the storage unitstores an initial balance state of the electric balance vehicle, and thecorrection unit corrects a current balance state of the electric balancevehicle.